On Parthenogenesis: Or The Successive Production of Procreating Individuals from a Single Ovum; a Discourse Introduction to the Hunterian Lectures on Generation and Devleopment, for the Year 1849 ; Delivered at the Royal College of Surgeons of EnglandJ. Van Voorst, 1849 - 76 páginas |
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Página 8
... Aphides . In most of the lower classes of animals the course of de- velopment is temporarily arrested at certain stages , though growth may go on ; the embryo moving and feeding , and perhaps propagating , as if it were a completed ...
... Aphides . In most of the lower classes of animals the course of de- velopment is temporarily arrested at certain stages , though growth may go on ; the embryo moving and feeding , and perhaps propagating , as if it were a completed ...
Página 23
... Aphides or Plant - lice . And because it was the first of a large class of phænomena , till then utterly unknown and unsuspected , it was received with considerable doubt , or met by total incredulity . The facts are briefly these . The ...
... Aphides or Plant - lice . And because it was the first of a large class of phænomena , till then utterly unknown and unsuspected , it was received with considerable doubt , or met by total incredulity . The facts are briefly these . The ...
Página 24
... aphides : and carefully pro- secuted experiments have shown that this procreation from a virgin mother will continue to the seventh , the ninth , or the eleventh generation before the spermatic virtue of the ancestral coitus has been ...
... aphides : and carefully pro- secuted experiments have shown that this procreation from a virgin mother will continue to the seventh , the ninth , or the eleventh generation before the spermatic virtue of the ancestral coitus has been ...
Página 27
... Aphides possible and conceivable , and I have the greater confidence in the truth of that insight from finding it equally explanatory of the analogous phænomena of Lucina sine concubitu ' in other animals . These phænomena , first ...
... Aphides possible and conceivable , and I have the greater confidence in the truth of that insight from finding it equally explanatory of the analogous phænomena of Lucina sine concubitu ' in other animals . These phænomena , first ...
Página 28
... Aphides , referred the phænomena of the generation of the larviparous Aphides to ' spontaneous or equivocal generation . ' Now if we con- sider what we actually learn from these words , -that the larvæ produced by the virgin Aphides are ...
... Aphides , referred the phænomena of the generation of the larviparous Aphides to ' spontaneous or equivocal generation . ' Now if we con- sider what we actually learn from these words , -that the larvæ produced by the virgin Aphides are ...
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Términos y frases comunes
aggregate alternate analogy animal animalcule Annelides Aphides assimilation body called cercariform chorion ciliated coalesce continuous growth Coryne Dalyell derivative germ-cells detached distinct Distoma division Echinus Ehrenberg embryo Entozoa Entozoon essential condition explanation fact flower fluid formation gemmiparous germ germ-cells and nuclei germ-mass germ-yelk germinal vesicle granular Gregarina gregariniform Hydra Hydra Tuba impregnated ovum individual insects integument Kölliker larvæ larval Aphis larviparous Aphis leaf limbs Medusa medusiform ment metamorphosed mode modifications monad monadiform multiplication of cells nature nucleated cells nucleus nutriment observed organs ovarian oviparous oviparous females ovum parent Parthenogenesis pellucid centre phænomena physiologist phytons plant planulæ Pluteus Polygastria polype pregnated primary impregnated germ-cell procreation produced Prof progeny propagated by gemmation regard resemble result retained Scyphistoma secondary germ-cell Siebold species spermatheca spermatic force spermatic virtue spermatozoon spontaneous fission stamen Steenstrup Strobila Strongyli successive tion tissues trematode unchanged virgin viviparous wet-nurse yelk zoophyte